Belt-gearing.



F. A. STIERHEIM BELT GEARING APPLICATION FILED SEPT. 2!. 1914.

Patented. Jan. 23, 1917.

3 SHEETS-SHEET I.

INVENTOR F. A. STIERHEHVI.

BELT GEARING.

APPLICATXON FILED SEPT. 22!, 19x4.

Patented Jan. 23, 1917.

3 SHEETS-SHEET 2.

INVENTOR F. A. STIERHEIM.

BELT GEARING.

APPLICATION FILED SEPLZI. 1914.

Patented Jan. 23, 1917.

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FRANCIS A. STIERHEIM, 0F PITTSBURGH, PENNSYLVANIA.

IBELT-GEARING.

Specification of Letters Patent.

Patented J an. 23, 191?.

Application filed September 21, 191 Serial No. 862,718.

T 0 all whom it may concern Be it known that I, FRANCIS A. STIERHEIM,residing at Pittsburgh, in the county of Allegheny and State ofPennsylvania, a citizen of the United States, have invented ordiscovered certain new and useful Improvements in Belt-Gearing, of whichimprovements the following is a specification.

The invention described herein relates to certain improvements in thetransmission of power by belts.

Heretofore it has been customary to arrange the driving and drivenpulleys in the loops at the ends of an endless belt, so that the drivenpulley will always revolve in the same direction as the driving pulley,except of course where the belt is crossed between the pulleys when thedriven pulley will rotate the reverse of the driving pulley. In caseswhere the direction of rotation of the driven pulley must be reversed,it is necessary to reverse the driving pulley or else to employ twobelts, one of which is crossed extending from two narrow or one widedriving pulley to two independently mounted driven pulleys. And furtherwhen because desirable to change the speed of the driven shaft withoutincreasing the speed of the driving shaft, the employment of cone orstepped pulleys on'the driving and driven shafts was necessary.

The invention described herein has for its object the driving from onepulley always in the same direction of two or more pulleys, in the sameor opposite directions and at the same or different rates of rotation,by a single belt.

The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification,Figure 1 is a side elevation showing an arrangement of a driving pulleyand two driven pulleys secured to a common shaft and the belt arrangedto rotate the driven pulleys in opposite directions respectively; Fig. 2is a view at right angles to Fig. 1 the mechanism employed forsupporting and adjusting the idler being removed; Fig. 3 is a viewsimilar to Fig. 2, showing the driven pulleys differing in diameter andmounted on independent shafts; Fig. 4: shows two driven pulleys securedto a common shaft and two pulleys loosely mounted on the shaftintermediate the driven pulleys, .and showing the idler carried on alaterally movable frame; Fig. 5

is a sectional view on a plane indicated by the line VV Fig. 4; Fig. 6shows a plurality of pulleys of different dimension secured on a commonshaft and a corresponding number of loose pulleys, the belt beingarranged to drive adjoining pulleys in opposite directions; Fig. 7 is aview of the arrangement shown in Fig. 6, but at right angles to Fig. 6,and Fig. 8 shows pulleys on a plurality of shafts driven by a commonbelt.

While the transmission of power from the driving to the driven shaft orshafts is for convenience shown and described herein as being in ahorizontal direction, it will be understood that the elements involvedin the practice of my invention may be arranged to transmit powervertically or at any angle between vertical and horizontal.

In the practice of the invention the pulley l is secured to the drivingshaft 2, and is made of .a width dependent upon the number of parts orelements to be driven and their relative arrangement as hereinafter setforth. In the construction shown in Figs. 1 and 2 the section a of theendless belt 3 passes from the pulley l to the underside of andpartially around the pulley l on the shaft 5. The section b of the beltpasses from the upper side of the pulley to and partially around theidler 6 and from this idler the section 0 of the belt passes to theupper side of and partially around the pulley 7 on the same shaft. Thesection 03 of the belt passes from the underside of pulley 7 to theunderside of and partially around the driving pulley 1. As the beltpasses around the loose pulleys 4 and 7 in opposite directions they willbe driven in opposite directions when the belt is in frictionalengagement with them respectively, and when shifted from one loosepulley as 4: onto the table the tight pulley 8, the latter will bedriven as the pulley 4.. When the belt is shifted from loose pulley 7onto the tight pulley 8, the latter will'be rotated in a reversedirection.

As shown in Fig. 1 the'idler 6 is loosely mounted on the pin orfshaft 9carried by the arms of a yoke 10 which is'carried by a slide 11 mountedon the base 12. The slide can be shifted along the base, which can besecured to any suitable support, by means of the screw 13 to increasethe tension of the belt. In order to insure that the belt will remain onthe idler its face should be at right angles to the section a of thebelt, and as it is dificult to secure and maintain the base 12 so thatthe face of the idler shall be in proper position, the yoke 10 ispivotally mounted in the slide as'shown in Fig. 1 and is provided with alug 14 bearing on the screw 15, so that by turning the latter the pulleycan be properly adjusted.

In Will be observed that in my improved construction the ends of thebelt can be secured together after being passed around the drivingpulley and the belt then adjusted to position on the other pulleys andidler.

It is characteristic of my improvement that not only can the driven partor parts be rotated in opposite directions by a single belt withoutreversing the driving element, but the belt can by a proper location ofthe idler be caused to engage the driven pulleys for greater portions oftheir peripheries than is possible under the present practice. This moreefficient driving engagement of the belt with the pulleys can be broughtabout by so supporting the idler that it will be intermediate the beltand a line tangential to the upper portion of the peripheries of thepulleys 1 and 4 in Fig. 1.

Any suitable construction of belt shifter may be employed for shiftingthe belt from the pulleys 4 and 7 to the tight pulley 8 and the reverse,such for example as that shown in Fig. 2, consisting generally stated oftwo levers 16 and 17 pivotally mounted on a suitably supported base andprovided respectively at one end with pins 18 and 19, the pins 18projecting downward along opposite edges of the section a of the beltand the pins 18 in lever 17 projecting upwardly along opposite edges ofthe section 0 of the belt. At their opposite ends the levers areprovided each with a long and a short prong 20 and 21 and on the frameis mounted a slide 22 provided on opposite edges with lugs 23. Theselugs are so located that when the slide is moved down in Fig. 2 the lug23 will engage prong 20 on lever 17 and shift the belt from pulley 7 topulley 8.

' In order that a belt may not work off the face of a driven pulley, theface of the latter' should be at right angles to the driving portion ofthe belt. As for example, the driving portion a of the belt is at anangle to the axis of the shaft 5, carrying the pulley 4, and in order toprevent the belt working off the pulley 4, the face of the latter is soconstructed-as to be at right angles to the portion a of the belt asshown in Figs. 2, 6 and 8. The angle of inclination of the face of thedriven pulley to its axis should vary in accordance with'the angle whichthe driving portion of the belt forms with the axis of the drivenpulley.

In Fig. 3 two pulleys 4 and 7 are shown loosely mounted on the shaft 5but adapted to be connected alternately to the shaft by clutchmechanisms 25 and 26. The belt 3 is arranged as shown in Figs. 1 and 2so as to rotate the pulleys 4 and 7 in opposite directions. As shown inFig.3 the driven pulleys may differ in diameter although driven by thesame belt from a common driving pulley.

In Figs. 4 and 5, two loose pulleys 4 and 7 are shown intermediate thetight pulleys 8 and 8 which are secured to the shaft 5. The base 12 ofthe slide 11 carrying the idler 6 is mounted to swing on the pivot pin27 preferably arranged with its axis in a plane passing between theloose pulleys 4, 7. By shifting the base 'on its pivot pin the beltsections can be shifted from the loose to the tight pulleys. lVhile theswinging of the idler is effective to shift the belt, the lateralmovements of the belt are sluggish and in order to accelerate thesemovements it is preferred to arrange pins 28 on the base on oppositesides of the belt sections moving onto the pulleys on shaft 5, asclearly shown in Fig. 4. The base 12 may be shiftedby any suitablemeans, such for exampleas that shown in Fig. 4. A pivotally mounted arm29 is provided with a toothed segment 30 intermeshing with a pinion 31on a shaft 32 which carries a rocker arm 33 having its outer endconnected to the base 12 by a link 34. The arm 29 is shifted by a lever35 connected to the arm by a link 36.

In Figs. 6 and 7 a plurality of pulleys is shown driven by the samebelt, the pulleys differing in diameter so that the speed of the shaft 5may be changed by shifting one portion of the belt onto a loose pulleyand another onto a tight pulley either larger or smaller than the tightpulley from which the first portion of the belt was shifted. In theconstruction shown in Figs. 6 and 7, the section a of the belt passesbelow the tight and loose pulleys 4, 4*, the section b to and around theidler 6, the section 0 abov'e the tight and loose pulleys 7, 7 thesection 6 to and around a second idler 37, the section f below the tightand loose pulleys 38, 38 and the section cl partially around idlers 39and 40 to the underside of the driving pulley 1. Theidler 6 is carriedby a' slide 12 as shown in Fig. 7, for the adjustment of the tension ofthe belt, as hereinbefore described. The idler 37 need not be adjustedand may be supported in any suitable manner known in the art. The idlers39 and 40 serve principally as guides to return the section 0? of thebelt to a line of movement to pass to and around the driving pulley. Theidler 39 may be loosely mounted on the shaft carrying the idler 37 andthe idler 40 may be loosely mounted on the pin or shaft 9 carrying theidler '6 or otherwise suitably supported. With the belt arranged aroundthe driven pulleys as shown in Figs. 6 and 7, said pulleys will berotated alternately in opposite directions, but it will be readily seenthat the belt may be so arranged that all the pulleys may be driven inthe same direction which may be the same or the reverse of the directionof rotation of the driving pulley.

As will be seen by reference to Fig. 8, the driven pulleys may bearranged on independent shafts 5, L1 and 42, all of which may be drivenin the same direction, or one in one direction and another in anopposite direction. The rates of rotation of the shafts will bedependent on the diameters of the driven pulleys relative to that of thedriving pulleys.

It is characteristic of my improvement that two or more driven pulleysare in frictional engagement with what might be termed the sides or legsof a belt passing around a single driving pulley. Or to state theimprovement in another way, the driving pulley and a plurality of drivenpulleys are partially inclosed by loops formed on an endless belt.

I claim herein as my invention:

1. A power transmitting mechanism having in combination a drivingpulley, a plurality of driven pulleys, an idler and a belt inclosingsaid pulleys and idler in independentloops, the driven pulleys havingtheir faces at right angles to the portion of the belt operating todrive the respective pulley.

2. A power transmitting mechanism hav- Gopies of this patent may beobtained for five cents each, by addressing the Washington, D. Q.

on the driven pulleys as to rotate the latter in opposite directionsrespectively, the driven pulleys having their faces at right angles tothe portion of the belt operating to drive the respective pulley.

4. A power transmitting mechanism having in combination a drivingpulley, a plurality of driven pulleys, an idler and a belt passingaround the idler and frictionally engaging said pulleys, said elementsbeing so constructed that different rates of rotation are imparted tothe respective driven pulleys, the driven pulleys having their faces atright angles to the portion of the belt operating to drive therespective pulley.

5. A power transmitting mechanism having in combination a drivingpulley, a plurality of shafts, fast and loose pulleys carried by each ofthe said shafts, a belt driven by the driving pulley and havingsuccessive loops adapted to engage the fast and loose pulleys, each ofsaid loops being movable from its fast to its loose pulley and viceversa, without any shifting of the other loops.

6. A power transmitting mechanism having in combination a drivingpulley, a plurality of simultaneously driven pulleys, an idlerintermediate said driven pulleys as regards belt movement, a beltinclosing said pulleys and idler in independent loops, and means foradjusting the idler, the driven pulleys having their faces at rightangles to the portion of the belt operating to drive the respectivepulley.

In testimony whereof, I have hereunto set my hand.

FRANCIS A. STIERHEIM.

Witnesses:

ALICE A. TRILL, THos. B. JoYoE.

Qommisaioner or Patents,

